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Discussion Starter · #1 ·
I run a Tial bov right in front of my throttle body. It is vented to atmospheric and will flutter at cruzing speeds. It has been brought to my attention that it is not the right bov for my set up. If anyone has a bov they would trade me straight up for or knows any way to fix this problem that would be great.
 

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I run the stock turbo. Will a different spring help?
What psi spring is in now?

Stock vacuum is -9 to -10 psi or -20 mmHg
 

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Discussion Starter · #6 ·
Clipse I honestly don't know. Bought the set up used. Is there anyway to look at find out. Idk how they mark the springs. Maybe buy the size of it? Like I said Idk? Would like to get it squared away before I come see you tho.
 

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If you have a MAF then you can not run VTA . You need to recirculate you venting. That is a way it designed the evo set up with MAF sensor in place.
Its not a BOV cutting , that is your actual engine ECU. It sense the disturbance in the air flow (hence no recurculate) and cutting the engine.
There is no spring or anything will help on that. Either you get a new BOV not VTA or as I said before get that valve to recirculate.

Rob
 

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Discussion Starter · #14 ·
Sorry guys I'm on my phone and am one step behind in my posts. I don't think my Tial can be made to recirculate. So I will have to buy a new intake and bov. Unless there is a way to get rid of my maf that doesn't fuck up my daily driver car.
 

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I think its an easier route to get a recirc new bov for thje car ;)
 

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So there is no way to have vta on a EVO. Without messing with maf?
VTA is fine, don't listen to those people.

What spring are you running now? I have the same thing, Tial 50mm VTA. You'll want a -9psi spring. -12 is way too stiff and the valve won't even open at full boost...you'll get some crazy off throttle surge.

You're getting a little surge (fluttering) because the BOV is staying closed, like it's supposed to, and your turbo is basically spooling too fast at part throttle, flowing more air than the engine can take in. Either adjust your right foot, or adjust your MIVEC and wastegate duty cycles a little so it doesn't spool so fast at part throttle.

There will always be part throttle situations with high load/low rpm when you can't avoid that light surge, but you can minimize it by tweaking the above mentioned tables.
 

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Discussion Starter · #19 ·
Thanks for the help man. I will be checking into the spring i have this weekend when i have some time. I will then get my tuner to take a look into the adjustments mentioned. Your OB is lookin sick to man.
 

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Bugh... PLEASE don't listen to the VTA crowd.

You have a guy that professionally drives a rally car (IE: POUNDS THE EVERLOVING PUSSY OUT OF HIS CAR) telling you to recirc...
 
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